Alec Baldwin "felt sorry" for his former Broadway co-star Shia LaBeouf when he saw the troubled actor walk a red carpet with a paper bag over his head.

The Transformers actor has grabbed headlines over the last few weeks with his increasingly bizarre antics, which included donning the paper bag for the premiere of his film Nymphomaniac at a film festival in Germany, and launching himself as part of a live art show in Los Angeles.

Baldwin fell out with LaBeouf while they were working on Broadway play Orphans last year, and the young actor was subsequently fired from show, but the former 30 Rock star admits he feels bad about his current troubles.

In an article published in New York Magazine, Baldwin rips apart everyone from Anderson Cooper to MSNBC's Rachel Maddow and Shia LaBeouf. About the actor he writes, "Shia LaBeouf went to a film screening recently and he wore a bag over his head and the bag says 'I Am Not Famous ­ Anymore'. And there was truly a part of me that felt sorry for him, oddly enough."

Baldwin adds of his difficulties working with LaBeouf, "I'd heard from other people that he was potentially very difficult to work with, but I always ignore that because people say the same thing about me... LaBeouf seems to carry with him, to put it mildly, a jailhouse mentality wherever he goes... I think he was shocked (when he was fired). He had that card, that card you get when you make films that make a lot of money that gives you a certain kind of entitlement. I think he was surprised that it didn't work in the theatre".